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Debt - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Swap
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Senior credit facility [Member]
Dec. 31, 2013
Two interest rate swap agreements [Member]
Dec. 05, 2012
Senior Notes, interest at 3.125%, maturing 2023 [Member]
Dec. 31, 2013
Senior Notes, interest at 3.125%, maturing 2023 [Member]
Dec. 31, 2012
Senior Notes, interest at 3.125%, maturing 2023 [Member]
Dec. 31, 2012
Senior Notes, interest at 7.875%, maturing 2014 [Member]
Dec. 31, 2013
Senior Notes, interest at 7.375%, maturing 2015 [Member]
Dec. 31, 2012
Senior Notes, interest at 7.375%, maturing 2015 [Member]
Dec. 31, 2013
Senior Notes, interest at 6.75%, maturing 2018 [Member]
Dec. 31, 2012
Senior Notes, interest at 6.75%, maturing 2018 [Member]
Dec. 31, 2013
Senior Notes, interest at 7.15%, maturing 2019 [Member]
Dec. 31, 2012
Senior Notes, interest at 7.15%, maturing 2019 [Member]
Dec. 31, 2012
6.25% Senior Notes due 2013 [Member]
Dec. 31, 2012
Senior Notes, interest at 6.25%, redeemed in 2012 [Member]
Debt Instrument [Line Items]                                  
Issued new debt       $ 1,750,000,000   $ 350,000,000                      
Maturity period of facility       Feb. 01, 2018   Feb. 15, 2023                      
Available borrowing capacity under its domestic and foreign lines of credit 1,750,000,000                                
Incentive, in the form of mortgages and other loan     10,000,000                            
Principal threshold limit The Loan had an opportunity for $7 million principal forgiveness if a certain employment threshold was met before December 31, 2014.                                
Loan forgiven under employment threshold 7,000,000                                
Tender offer to purchase outstanding Senior Notes                 321,000,000   156,000,000   29,000,000   40,000,000    
Extinguishment of Senior Notes                 833,000,000               513,000,000
Option exercised to redeem the remaining                 179,000,000             495,000,000  
Charge on debt extinguishment   (128,000,000) (16,000,000)           (113,000,000)               (15,000,000)
Interest rate stated rate           3.125% 3.125% 3.125% 7.875% 7.375% 7.375% 6.75% 6.75% 7.15% 7.15% 6.25%  
Prepaid third party   52,000,000                              
Number of interest rate swaps 4                                
Notional amount of interest rate swaps         $ 200,000,000